g Exercise 3: Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time. Step 4: Construct the confidence interval. (Round to four decimal places.) O (-1.8653, 1.8653) (34.1347,37.8653) (34.1348,37.8654) The confidence interval can not be determine at this point.

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Exercise 3: Suppose average pizza delivery times are normally distributed with
an unknown population mean and a population standard deviation of six
minutes. A random sample of 28 pizza delivery restaurants is taken and has a
sample mean delivery time of 36 minutes.
Find a 90% confidence interval estimate for the population mean delivery time.
Step 4: Construct the confidence interval. (Round to four decimal places.)
O (-1.8653, 1.8653)
(34.1347,37.8653)
(34.1348,37.8654)
The confidence interval can not be determine at this point.
Transcribed Image Text:g Exercise 3: Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time. Step 4: Construct the confidence interval. (Round to four decimal places.) O (-1.8653, 1.8653) (34.1347,37.8653) (34.1348,37.8654) The confidence interval can not be determine at this point.
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